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[thirdparty/cups.git] / cups / auth.c
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ef416fc2 1/*
7e86f2f6 2 * Authentication functions for CUPS.
ef416fc2 3 *
1f679daf
MS
4 * Copyright © 2007-2018 by Apple Inc.
5 * Copyright © 1997-2007 by Easy Software Products.
ef416fc2 6 *
7e86f2f6
MS
7 * This file contains Kerberos support code, copyright 2006 by
8 * Jelmer Vernooij.
f7deaa1a 9 *
7e86f2f6
MS
10 * These coded instructions, statements, and computer programs are the
11 * property of Apple Inc. and are protected by Federal copyright
12 * law. Distribution and use rights are outlined in the file "LICENSE.txt"
13 * which should have been included with this file. If this file is
57b7b66b 14 * missing or damaged, see the license at "http://www.cups.org/".
ef416fc2 15 *
7e86f2f6 16 * This file is subject to the Apple OS-Developed Software exception.
ef416fc2 17 */
18
19/*
20 * Include necessary headers...
21 */
22
71e16022 23#include "cups-private.h"
ef416fc2 24#include <fcntl.h>
25#include <sys/stat.h>
26#if defined(WIN32) || defined(__EMX__)
27# include <io.h>
28#else
29# include <unistd.h>
30#endif /* WIN32 || __EMX__ */
31
f7deaa1a 32#if HAVE_AUTHORIZATION_H
33# include <Security/Authorization.h>
34# ifdef HAVE_SECBASEPRIV_H
35# include <Security/SecBasePriv.h>
36# else
37extern const char *cssmErrorString(int error);
38# endif /* HAVE_SECBASEPRIV_H */
39#endif /* HAVE_AUTHORIZATION_H */
40
bc44d920 41#if defined(SO_PEERCRED) && defined(AF_LOCAL)
42# include <pwd.h>
43#endif /* SO_PEERCRED && AF_LOCAL */
44
ef416fc2 45
46/*
47 * Local functions...
48 */
49
1f717210
MS
50static const char *cups_auth_find(const char *www_authenticate, const char *scheme);
51static const char *cups_auth_param(const char *scheme, const char *name, char *value, size_t valsize);
52static const char *cups_auth_scheme(const char *www_authenticate, char *scheme, size_t schemesize);
53
f7deaa1a 54#ifdef HAVE_GSSAPI
eac3a0a0
MS
55# ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
56# ifdef HAVE_GSS_GSSAPI_SPI_H
57# include <GSS/gssapi_spi.h>
58# else
a2326b5b
MS
59# define GSS_AUTH_IDENTITY_TYPE_1 1
60# define gss_acquire_cred_ex_f __ApplePrivate_gss_acquire_cred_ex_f
53af7f21 61typedef struct gss_auth_identity /* @private@ */
eac3a0a0
MS
62{
63 uint32_t type;
64 uint32_t flags;
65 char *username;
66 char *realm;
67 char *password;
68 gss_buffer_t *credentialsRef;
49c59293 69} gss_auth_identity_desc;
eac3a0a0
MS
70extern OM_uint32 gss_acquire_cred_ex_f(gss_status_id_t, const gss_name_t,
71 OM_uint32, OM_uint32, const gss_OID,
72 gss_cred_usage_t, gss_auth_identity_t,
73 void *, void (*)(void *, OM_uint32,
74 gss_status_id_t,
75 gss_cred_id_t,
76 gss_OID_set,
77 OM_uint32));
78# endif /* HAVE_GSS_GSSAPI_SPI_H */
79# include <dispatch/dispatch.h>
80typedef struct _cups_gss_acquire_s /* Acquire callback data */
81{
82 dispatch_semaphore_t sem; /* Synchronization semaphore */
83 OM_uint32 major; /* Returned status code */
84 gss_cred_id_t creds; /* Returned credentials */
85} _cups_gss_acquire_t;
86
87static void cups_gss_acquire(void *ctx, OM_uint32 major,
88 gss_status_id_t status,
89 gss_cred_id_t creds, gss_OID_set oids,
90 OM_uint32 time_rec);
91# endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */
92static gss_name_t cups_gss_getname(http_t *http, const char *service_name);
f7deaa1a 93# ifdef DEBUG
e07d4801
MS
94static void cups_gss_printf(OM_uint32 major_status, OM_uint32 minor_status,
95 const char *message);
355e94dc 96# else
e07d4801
MS
97# define cups_gss_printf(major, minor, message)
98# endif /* DEBUG */
f7deaa1a 99#endif /* HAVE_GSSAPI */
ef416fc2 100static int cups_local_auth(http_t *http);
101
102
103/*
104 * 'cupsDoAuthentication()' - Authenticate a request.
105 *
cb7f98ee 106 * This function should be called in response to a @code HTTP_STATUS_UNAUTHORIZED@
ef416fc2 107 * status, prior to resubmitting your request.
108 *
8072030b 109 * @since CUPS 1.1.20/macOS 10.4@
ef416fc2 110 */
111
112int /* O - 0 on success, -1 on error */
f11a948a
MS
113cupsDoAuthentication(
114 http_t *http, /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
115 const char *method, /* I - Request method ("GET", "POST", "PUT") */
116 const char *resource) /* I - Resource path */
ef416fc2 117{
3e7fe0ca 118 const char *password, /* Password string */
1f717210
MS
119 *www_auth, /* WWW-Authenticate header */
120 *schemedata; /* Scheme-specific data */
121 char scheme[256], /* Scheme name */
122 prompt[1024], /* Prompt for user */
ef416fc2 123 realm[HTTP_MAX_VALUE], /* realm="xyz" string */
5a738aea 124 nonce[HTTP_MAX_VALUE]; /* nonce="xyz" string */
f7deaa1a 125 int localauth; /* Local authentication result */
b86bc4cf 126 _cups_globals_t *cg; /* Global data */
ef416fc2 127
128
807315e6 129 DEBUG_printf(("cupsDoAuthentication(http=%p, method=\"%s\", resource=\"%s\")", (void *)http, method, resource));
ef416fc2 130
f11a948a
MS
131 if (!http)
132 http = _cupsConnect();
133
134 if (!http || !method || !resource)
135 return (-1);
136
5a6b583a
MS
137 DEBUG_printf(("2cupsDoAuthentication: digest_tries=%d, userpass=\"%s\"",
138 http->digest_tries, http->userpass));
139 DEBUG_printf(("2cupsDoAuthentication: WWW-Authenticate=\"%s\"",
140 httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE)));
141
ef416fc2 142 /*
143 * Clear the current authentication string...
144 */
145
355e94dc 146 httpSetAuthString(http, NULL, NULL);
ef416fc2 147
148 /*
149 * See if we can do local authentication...
150 */
151
f7deaa1a 152 if (http->digest_tries < 3)
ef416fc2 153 {
f7deaa1a 154 if ((localauth = cups_local_auth(http)) == 0)
155 {
e07d4801 156 DEBUG_printf(("2cupsDoAuthentication: authstring=\"%s\"",
f7deaa1a 157 http->authstring));
f14324a7 158
cb7f98ee 159 if (http->status == HTTP_STATUS_UNAUTHORIZED)
f7deaa1a 160 http->digest_tries ++;
f14324a7 161
f7deaa1a 162 return (0);
163 }
164 else if (localauth == -1)
f11a948a 165 {
cb7f98ee 166 http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
f7deaa1a 167 return (-1); /* Error or canceled */
f11a948a 168 }
ef416fc2 169 }
170
171 /*
1f717210 172 * Nope, loop through the authentication schemes to find the first we support.
ef416fc2 173 */
174
1f717210 175 www_auth = httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE);
3e7fe0ca 176
1f717210 177 for (schemedata = cups_auth_scheme(www_auth, scheme, sizeof(scheme)); schemedata; schemedata = cups_auth_scheme(schemedata + strlen(scheme), scheme, sizeof(scheme)))
ef416fc2 178 {
179 /*
1f717210 180 * Check the scheme name...
ef416fc2 181 */
182
1f717210
MS
183#ifdef HAVE_GSSAPI
184 if (!_cups_strcasecmp(scheme, "Negotiate"))
185 {
186 /*
187 * Kerberos authentication...
188 */
5a9febac 189
1f717210
MS
190 if (_cupsSetNegotiateAuthString(http, method, resource))
191 {
192 http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
193 return (-1);
194 }
b86bc4cf 195
1f717210
MS
196 break;
197 }
198 else
199#endif /* HAVE_GSSAPI */
200 if (_cups_strcasecmp(scheme, "Basic") && _cups_strcasecmp(scheme, "Digest"))
201 continue; /* Not supported (yet) */
b86bc4cf 202
1f717210
MS
203 /*
204 * See if we should retry the current username:password...
205 */
5a9febac 206
1f717210
MS
207 if ((http->digest_tries > 1 || !http->userpass[0]) && (!_cups_strcasecmp(scheme, "Basic") || (!_cups_strcasecmp(scheme, "Digest"))))
208 {
209 /*
210 * Nope - get a new password from the user...
211 */
ef416fc2 212
1f717210
MS
213 char default_username[HTTP_MAX_VALUE];
214 /* Default username */
ef416fc2 215
1f717210 216 cg = _cupsGlobals();
ef416fc2 217
1f717210
MS
218 if (!cg->lang_default)
219 cg->lang_default = cupsLangDefault();
ef416fc2 220
1f679daf 221 if (cups_auth_param(schemedata, "username", default_username, sizeof(default_username)))
1f717210 222 cupsSetUser(default_username);
5a6b583a 223
1f717210 224 snprintf(prompt, sizeof(prompt), _cupsLangString(cg->lang_default, _("Password for %s on %s? ")), cupsUser(), http->hostname[0] == '/' ? "localhost" : http->hostname);
5a6b583a 225
1f717210
MS
226 http->digest_tries = _cups_strncasecmp(scheme, "Digest", 6) != 0;
227 http->userpass[0] = '\0';
ef416fc2 228
1f717210
MS
229 if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
230 {
231 http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
232 return (-1);
233 }
234
235 snprintf(http->userpass, sizeof(http->userpass), "%s:%s", cupsUser(), password);
236 }
237 else if (http->status == HTTP_STATUS_UNAUTHORIZED)
238 http->digest_tries ++;
f7deaa1a 239
1f717210 240 if (http->status == HTTP_STATUS_UNAUTHORIZED && http->digest_tries >= 3)
f7deaa1a 241 {
1f717210
MS
242 DEBUG_printf(("1cupsDoAuthentication: Too many authentication tries (%d)", http->digest_tries));
243
cb7f98ee 244 http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
f7deaa1a 245 return (-1);
246 }
1f717210 247
ef416fc2 248 /*
1f717210 249 * Got a password; encode it for the server...
ef416fc2 250 */
251
1f717210
MS
252 if (!_cups_strcasecmp(scheme, "Basic"))
253 {
254 /*
255 * Basic authentication...
256 */
257
258 char encode[256]; /* Base64 buffer */
5a738aea 259
1f717210
MS
260 httpEncode64_2(encode, sizeof(encode), http->userpass, (int)strlen(http->userpass));
261 httpSetAuthString(http, "Basic", encode);
262 }
263 else if (!_cups_strcasecmp(scheme, "Digest"))
264 {
265 /*
266 * Digest authentication...
267 */
5a738aea 268
1f717210
MS
269 int i; /* Looping var */
270 char algorithm[65], /* Hashing algorithm */
271 opaque[HTTP_MAX_VALUE],
272 /* Opaque data from server */
273 cnonce[65], /* cnonce value */
274 kd[65], /* Final MD5/SHA-256 digest */
275 ha1[65], /* Hash of username:realm:password */
276 ha2[65], /* Hash of method:request-uri */
277 hdata[65], /* Hash of auth data */
278 temp[1024], /* Temporary string */
279 digest[1024]; /* Digest auth data */
280 unsigned char hash[32]; /* Hash buffer */
281 const char *hashalg; /* Hashing algorithm */
282 size_t hashsize; /* Size of hash */
283
284 if (strcmp(nonce, http->nonce))
285 {
286 strlcpy(http->nonce, nonce, sizeof(http->nonce));
287 http->nonce_count = 1;
288 }
289 else
290 http->nonce_count ++;
ef416fc2 291
1f717210
MS
292 cups_auth_param(schemedata, "opaque", opaque, sizeof(opaque));
293 cups_auth_param(schemedata, "nonce", nonce, sizeof(nonce));
294 cups_auth_param(schemedata, "realm", realm, sizeof(realm));
295
296 for (i = 0; i < 64; i ++)
297 cnonce[i] = "0123456789ABCDEF"[CUPS_RAND() & 15];
298 cnonce[64] = '\0';
299
300 if (cups_auth_param(schemedata, "algorithm", algorithm, sizeof(algorithm)))
301 {
302 /*
303 * Follow RFC 2617/7616...
304 */
355e94dc 305
1f717210
MS
306 if (!_cups_strcasecmp(algorithm, "MD5"))
307 {
308 /*
309 * RFC 2617 Digest with MD5
310 */
ef416fc2 311
1f717210
MS
312 hashalg = "md5";
313 }
314 else if (!_cups_strcasecmp(algorithm, "SHA-256"))
315 {
316 /*
317 * RFC 7616 Digest with SHA-256
318 */
319
320 hashalg = "sha2-256";
321 }
322 else
323 {
324 /*
325 * Some other algorithm we don't support, skip this one...
326 */
327
328 continue;
329 }
330
331 /*
332 * Calculate digest value...
333 */
334
335 /* H(A1) = H(username:realm:password) */
336 snprintf(temp, sizeof(temp), "%s:%s:%s", cupsUser(), realm, strchr(http->userpass, ':') + 1);
337 hashsize = (size_t)cupsHashData(hashalg, (unsigned char *)temp, strlen(temp), hash, sizeof(hash));
338 cupsHashString(hash, hashsize, ha1, sizeof(ha1));
339
340 /* H(A2) = H(method:uri) */
341 snprintf(temp, sizeof(temp), "%s:%s", method, resource);
342 hashsize = (size_t)cupsHashData(hashalg, (unsigned char *)temp, strlen(temp), hash, sizeof(hash));
343 cupsHashString(hash, hashsize, ha2, sizeof(ha2));
344
345 /* H(data) = H(nonce:nc:cnonce:qop:H(A2)) */
346 snprintf(temp, sizeof(temp), "%s:%08x:%s:auth:%s", nonce, http->nonce_count, cnonce, ha2);
347 hashsize = (size_t)cupsHashData(hashalg, (unsigned char *)temp, strlen(temp), hash, sizeof(hash));
348 cupsHashString(hash, hashsize, hdata, sizeof(hdata));
349
350 /* KD = H(H(A1):H(data)) */
351 snprintf(temp, sizeof(temp), "%s:%s", ha1, hdata);
352 hashsize = (size_t)cupsHashData(hashalg, (unsigned char *)temp, strlen(temp), hash, sizeof(hash));
353 cupsHashString(hash, hashsize, kd, sizeof(kd));
354
355 /* Pass the RFC 2617/7616 WWW-Authenticate header */
356 if (opaque[0])
357 snprintf(digest, sizeof(digest), "username=\"%s\", realm=\"%s\", nonce=\"%s\", algorithm=%s, qop=auth, opaque=\"%s\", cnonce=\"%s\", nc=%08x, uri=\"%s\", response=\"%s\"", cupsUser(), realm, nonce, algorithm, opaque, cnonce, http->nonce_count, resource, kd);
358 else
359 snprintf(digest, sizeof(digest), "username=\"%s\", realm=\"%s\", nonce=\"%s\", algorithm=%s, qop=auth, cnonce=\"%s\", nc=%08x, uri=\"%s\", response=\"%s\"", cupsUser(), realm, nonce, algorithm, cnonce, http->nonce_count, resource, kd);
360 }
361 else
362 {
363 /*
364 * Use old RFC 2069 Digest method...
365 */
366
367 /* H(A1) = H(username:realm:password) */
368 snprintf(temp, sizeof(temp), "%s:%s:%s", cupsUser(), realm, strchr(http->userpass, ':') + 1);
369 hashsize = (size_t)cupsHashData("md5", (unsigned char *)temp, strlen(temp), hash, sizeof(hash));
370 cupsHashString(hash, hashsize, ha1, sizeof(ha1));
371
372 /* H(A2) = H(method:uri) */
373 snprintf(temp, sizeof(temp), "%s:%s", method, resource);
374 hashsize = (size_t)cupsHashData("md5", (unsigned char *)temp, strlen(temp), hash, sizeof(hash));
375 cupsHashString(hash, hashsize, ha2, sizeof(ha2));
376
377 /* KD = H(H(A1):nonce:H(A2)) */
378 snprintf(temp, sizeof(temp), "%s:%s:%s", ha1, nonce, ha2);
379 hashsize = (size_t)cupsHashData("md5", (unsigned char *)temp, strlen(temp), hash, sizeof(hash));
380 cupsHashString(hash, hashsize, kd, sizeof(kd));
381
382 /* Pass the RFC 2069 WWW-Authenticate header */
383 snprintf(digest, sizeof(digest), "username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"", cupsUser(), realm, nonce, resource, kd);
384 }
385
386 httpSetAuthString(http, "Digest", digest);
387 }
388 }
389
390 if (http->authstring)
391 {
392 DEBUG_printf(("1cupsDoAuthentication: authstring=\"%s\"", http->authstring));
393
394 return (0);
ef416fc2 395 }
f14324a7
MS
396 else
397 {
1f717210 398 DEBUG_printf(("1cupsDoAuthentication: Unknown auth type: \"%s\"", www_auth));
cb7f98ee 399 http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
1f717210 400
f14324a7
MS
401 return (-1);
402 }
ef416fc2 403}
404
405
f7deaa1a 406#ifdef HAVE_GSSAPI
f14324a7
MS
407/*
408 * '_cupsSetNegotiateAuthString()' - Set the Kerberos authentication string.
409 */
410
411int /* O - 0 on success, -1 on error */
412_cupsSetNegotiateAuthString(
eac3a0a0
MS
413 http_t *http, /* I - Connection to server */
414 const char *method, /* I - Request method ("GET", "POST", "PUT") */
415 const char *resource) /* I - Resource path */
f14324a7
MS
416{
417 OM_uint32 minor_status, /* Minor status code */
418 major_status; /* Major status code */
419 gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
07ed0e9a 420 /* Output token */
f14324a7
MS
421
422
321d8d57
MS
423 (void)method;
424 (void)resource;
425
f14324a7
MS
426# ifdef __APPLE__
427 /*
428 * If the weak-linked GSSAPI/Kerberos library is not present, don't try
429 * to use it...
430 */
431
6d8021f4 432 if (&gss_init_sec_context == NULL)
f14324a7
MS
433 {
434 DEBUG_puts("1_cupsSetNegotiateAuthString: Weak-linked GSSAPI/Kerberos "
435 "framework is not present");
436 return (-1);
437 }
438# endif /* __APPLE__ */
439
440 if (http->gssname == GSS_C_NO_NAME)
441 {
eac3a0a0 442 http->gssname = cups_gss_getname(http, _cupsGSSServiceName());
f14324a7
MS
443 }
444
445 if (http->gssctx != GSS_C_NO_CONTEXT)
446 {
447 gss_delete_sec_context(&minor_status, &http->gssctx, GSS_C_NO_BUFFER);
448 http->gssctx = GSS_C_NO_CONTEXT;
449 }
450
eac3a0a0
MS
451 major_status = gss_init_sec_context(&minor_status, GSS_C_NO_CREDENTIAL,
452 &http->gssctx,
453 http->gssname, http->gssmech,
454 GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
455 GSS_C_INDEFINITE,
456 GSS_C_NO_CHANNEL_BINDINGS,
457 GSS_C_NO_BUFFER, &http->gssmech,
458 &output_token, NULL, NULL);
459
1f717210 460# ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
eac3a0a0
MS
461 if (major_status == GSS_S_NO_CRED)
462 {
463 /*
464 * Ask the user for credentials...
465 */
466
467 char prompt[1024], /* Prompt for user */
468 userbuf[256]; /* Kerberos username */
469 const char *username, /* Username string */
470 *password; /* Password string */
471 _cups_gss_acquire_t data; /* Callback data */
49c59293 472 gss_auth_identity_desc identity; /* Kerberos user identity */
eac3a0a0
MS
473 _cups_globals_t *cg = _cupsGlobals();
474 /* Per-thread global data */
475
476 if (!cg->lang_default)
477 cg->lang_default = cupsLangDefault();
478
479 snprintf(prompt, sizeof(prompt),
480 _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
f228370c 481 cupsUser(), http->gsshost);
eac3a0a0
MS
482
483 if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
484 return (-1);
485
486 /*
487 * Try to acquire credentials...
488 */
489
490 username = cupsUser();
491 if (!strchr(username, '@'))
492 {
f228370c 493 snprintf(userbuf, sizeof(userbuf), "%s@%s", username, http->gsshost);
eac3a0a0
MS
494 username = userbuf;
495 }
496
497 identity.type = GSS_AUTH_IDENTITY_TYPE_1;
498 identity.flags = 0;
499 identity.username = (char *)username;
500 identity.realm = (char *)"";
501 identity.password = (char *)password;
502 identity.credentialsRef = NULL;
503
504 data.sem = dispatch_semaphore_create(0);
505 data.major = 0;
506 data.creds = NULL;
507
508 if (data.sem)
509 {
5dcbe84d 510 major_status = gss_acquire_cred_ex_f(NULL, GSS_C_NO_NAME, 0, GSS_C_INDEFINITE, GSS_KRB5_MECHANISM, GSS_C_INITIATE, (gss_auth_identity_t)&identity, &data, cups_gss_acquire);
eac3a0a0
MS
511
512 if (major_status == GSS_S_COMPLETE)
513 {
514 dispatch_semaphore_wait(data.sem, DISPATCH_TIME_FOREVER);
515 major_status = data.major;
516 }
517
518 dispatch_release(data.sem);
519
520 if (major_status == GSS_S_COMPLETE)
521 {
522 OM_uint32 release_minor; /* Minor status from releasing creds */
523
524 major_status = gss_init_sec_context(&minor_status, data.creds,
525 &http->gssctx,
526 http->gssname, http->gssmech,
527 GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
528 GSS_C_INDEFINITE,
529 GSS_C_NO_CHANNEL_BINDINGS,
530 GSS_C_NO_BUFFER, &http->gssmech,
531 &output_token, NULL, NULL);
532 gss_release_cred(&release_minor, &data.creds);
533 }
534 }
535 }
1f717210 536# endif /* HAVE_GSS_ACQUIRED_CRED_EX_F */
f14324a7
MS
537
538 if (GSS_ERROR(major_status))
539 {
540 cups_gss_printf(major_status, minor_status,
541 "_cupsSetNegotiateAuthString: Unable to initialize "
542 "security context");
543 return (-1);
544 }
545
1f717210 546# ifdef DEBUG
eac3a0a0 547 else if (major_status == GSS_S_CONTINUE_NEEDED)
f14324a7
MS
548 cups_gss_printf(major_status, minor_status,
549 "_cupsSetNegotiateAuthString: Continuation needed!");
1f717210 550# endif /* DEBUG */
f14324a7
MS
551
552 if (output_token.length > 0 && output_token.length <= 65536)
553 {
554 /*
555 * Allocate the authorization string since Windows KDCs can have
556 * arbitrarily large credentials...
557 */
558
7e86f2f6
MS
559 int authsize = 10 + /* "Negotiate " */
560 (int)output_token.length * 4 / 3 + 1 + 1;
561 /* Base64 + nul */
f14324a7
MS
562
563 httpSetAuthString(http, NULL, NULL);
564
7e86f2f6 565 if ((http->authstring = malloc((size_t)authsize)) == NULL)
f14324a7
MS
566 {
567 http->authstring = http->_authstring;
568 authsize = sizeof(http->_authstring);
569 }
570
07623986 571 strlcpy(http->authstring, "Negotiate ", (size_t)authsize);
f14324a7 572 httpEncode64_2(http->authstring + 10, authsize - 10, output_token.value,
7e86f2f6 573 (int)output_token.length);
f14324a7
MS
574
575 gss_release_buffer(&minor_status, &output_token);
576 }
577 else
578 {
579 DEBUG_printf(("1_cupsSetNegotiateAuthString: Kerberos credentials too "
580 "large - %d bytes!", (int)output_token.length));
581 gss_release_buffer(&minor_status, &output_token);
582
583 return (-1);
584 }
585
586 return (0);
587}
1f717210
MS
588#endif /* HAVE_GSSAPI */
589
590
591/*
592 * 'cups_auth_find()' - Find the named WWW-Authenticate scheme.
593 *
594 * The "www_authenticate" parameter points to the current position in the header.
595 *
596 * Returns @code NULL@ if the auth scheme is not present.
597 */
598
599static const char * /* O - Start of matching scheme or @code NULL@ if not found */
600cups_auth_find(const char *www_authenticate, /* I - Pointer into WWW-Authenticate header */
601 const char *scheme) /* I - Authentication scheme */
602{
603 size_t schemelen = strlen(scheme); /* Length of scheme */
604
605
606 DEBUG_printf(("8cups_auth_find(www_authenticate=\"%s\", scheme=\"%s\"(%d))", www_authenticate, scheme, (int)schemelen));
607
608 while (*www_authenticate)
609 {
610 /*
611 * Skip leading whitespace and commas...
612 */
613
614 DEBUG_printf(("9cups_auth_find: Before whitespace: \"%s\"", www_authenticate));
615 while (isspace(*www_authenticate & 255) || *www_authenticate == ',')
616 www_authenticate ++;
617 DEBUG_printf(("9cups_auth_find: After whitespace: \"%s\"", www_authenticate));
618
619 /*
620 * See if this is "Scheme" followed by whitespace or the end of the string.
621 */
622
b643d6ba 623 if (!strncmp(www_authenticate, scheme, schemelen) && (isspace(www_authenticate[schemelen] & 255) || www_authenticate[schemelen] == ',' || !www_authenticate[schemelen]))
1f717210
MS
624 {
625 /*
626 * Yes, this is the start of the scheme-specific information...
627 */
628
629 DEBUG_printf(("9cups_auth_find: Returning \"%s\".", www_authenticate));
630
631 return (www_authenticate);
632 }
633
634 /*
635 * Skip the scheme name or param="value" string...
636 */
637
638 while (!isspace(*www_authenticate & 255) && *www_authenticate)
639 {
640 if (*www_authenticate == '\"')
641 {
642 /*
643 * Skip quoted value...
644 */
645
646 www_authenticate ++;
647 while (*www_authenticate && *www_authenticate != '\"')
648 www_authenticate ++;
649
650 DEBUG_printf(("9cups_auth_find: After quoted: \"%s\"", www_authenticate));
651 }
652
653 www_authenticate ++;
654 }
655
656 DEBUG_printf(("9cups_auth_find: After skip: \"%s\"", www_authenticate));
657 }
658
659 DEBUG_puts("9cups_auth_find: Returning NULL.");
660
661 return (NULL);
662}
663
664
665/*
666 * 'cups_auth_param()' - Copy the value for the named authentication parameter,
667 * if present.
668 */
669
670static const char * /* O - Parameter value or @code NULL@ if not present */
671cups_auth_param(const char *scheme, /* I - Pointer to auth data */
672 const char *name, /* I - Name of parameter */
673 char *value, /* I - Value buffer */
674 size_t valsize) /* I - Size of value buffer */
675{
676 char *valptr = value, /* Pointer into value buffer */
bec85069 677 *valend = value + valsize - 1; /* Pointer to end of buffer */
1f717210
MS
678 size_t namelen = strlen(name); /* Name length */
679 int param; /* Is this a parameter? */
680
681
682 DEBUG_printf(("8cups_auth_param(scheme=\"%s\", name=\"%s\", value=%p, valsize=%d)", scheme, name, (void *)value, (int)valsize));
683
684 while (!isspace(*scheme & 255) && *scheme)
685 scheme ++;
686
687 while (*scheme)
688 {
689 while (isspace(*scheme & 255) || *scheme == ',')
690 scheme ++;
691
692 if (!strncmp(scheme, name, namelen) && scheme[namelen] == '=')
693 {
694 /*
695 * Found the parameter, copy the value...
696 */
697
698 scheme += namelen + 1;
699 if (*scheme == '\"')
700 {
701 scheme ++;
702
703 while (*scheme && *scheme != '\"')
704 {
705 if (valptr < valend)
706 *valptr++ = *scheme;
707
708 scheme ++;
709 }
710 }
711 else
712 {
713 while (*scheme && strchr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~+/=", *scheme))
714 {
715 if (valptr < valend)
716 *valptr++ = *scheme;
717
718 scheme ++;
719 }
720 }
721
722 *valptr = '\0';
723
724 DEBUG_printf(("9cups_auth_param: Returning \"%s\".", value));
725
726 return (value);
727 }
728
729 /*
730 * Skip the param=value string...
731 */
732
733 param = 0;
734
735 while (!isspace(*scheme & 255) && *scheme)
736 {
737 if (*scheme == '=')
738 param = 1;
739 else if (*scheme == '\"')
740 {
741 /*
742 * Skip quoted value...
743 */
744
745 scheme ++;
746 while (*scheme && *scheme != '\"')
747 scheme ++;
748 }
749
750 scheme ++;
751 }
752
753 /*
754 * If this wasn't a parameter, we are at the end of this scheme's
755 * parameters...
756 */
757
758 if (!param)
759 break;
760 }
761
762 *value = '\0';
763
764 DEBUG_puts("9cups_auth_param: Returning NULL.");
765
766 return (NULL);
767}
f14324a7
MS
768
769
1f717210
MS
770/*
771 * 'cups_auth_scheme()' - Get the (next) WWW-Authenticate scheme.
772 *
773 * The "www_authenticate" parameter points to the current position in the header.
774 *
775 * Returns @code NULL@ if there are no (more) auth schemes present.
776 */
777
778static const char * /* O - Start of scheme or @code NULL@ if not found */
779cups_auth_scheme(const char *www_authenticate, /* I - Pointer into WWW-Authenticate header */
780 char *scheme, /* I - Scheme name buffer */
781 size_t schemesize) /* I - Size of buffer */
782{
783 const char *start; /* Start of scheme data */
784 char *sptr = scheme, /* Pointer into scheme buffer */
785 *send = scheme + schemesize - 1;/* End of scheme buffer */
786 int param; /* Is this a parameter? */
787
788
789 DEBUG_printf(("8cups_auth_scheme(www_authenticate=\"%s\", scheme=%p, schemesize=%d)", www_authenticate, (void *)scheme, (int)schemesize));
790
791 while (*www_authenticate)
792 {
793 /*
794 * Skip leading whitespace and commas...
795 */
796
797 while (isspace(*www_authenticate & 255) || *www_authenticate == ',')
798 www_authenticate ++;
799
800 /*
801 * Parse the scheme name or param="value" string...
802 */
803
1f679daf 804 for (sptr = scheme, start = www_authenticate, param = 0; *www_authenticate && *www_authenticate != ',' && !isspace(*www_authenticate & 255); www_authenticate ++)
1f717210
MS
805 {
806 if (*www_authenticate == '=')
807 param = 1;
808 else if (!param && sptr < send)
809 *sptr++ = *www_authenticate;
810 else if (*www_authenticate == '\"')
811 {
812 /*
813 * Skip quoted value...
814 */
815
816 www_authenticate ++;
817 while (*www_authenticate && *www_authenticate != '\"')
818 www_authenticate ++;
819 }
820 }
821
822 if (sptr > scheme && !param)
823 {
824 *sptr = '\0';
825
826 DEBUG_printf(("9cups_auth_scheme: Returning \"%s\".", start));
827
828 return (start);
829 }
830 }
831
832 *scheme = '\0';
833
834 DEBUG_puts("9cups_auth_scheme: Returning NULL.");
835
836 return (NULL);
837}
838
839
840#ifdef HAVE_GSSAPI
eac3a0a0 841# ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
f7deaa1a 842/*
eac3a0a0
MS
843 * 'cups_gss_acquire()' - Kerberos credentials callback.
844 */
845static void
846cups_gss_acquire(
847 void *ctx, /* I - Caller context */
848 OM_uint32 major, /* I - Major error code */
849 gss_status_id_t status, /* I - Status (unused) */
850 gss_cred_id_t creds, /* I - Credentials (if any) */
851 gss_OID_set oids, /* I - Mechanism OIDs (unused) */
852 OM_uint32 time_rec) /* I - Timestamp (unused) */
853{
854 uint32_t min; /* Minor error code */
855 _cups_gss_acquire_t *data; /* Callback data */
856
857
858 (void)status;
859 (void)time_rec;
860
861 data = (_cups_gss_acquire_t *)ctx;
862 data->major = major;
863 data->creds = creds;
864
865 gss_release_oid_set(&min, &oids);
866 dispatch_semaphore_signal(data->sem);
867}
868# endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */
869
870
871/*
872 * 'cups_gss_getname()' - Get CUPS service credentials for authentication.
f7deaa1a 873 */
874
875static gss_name_t /* O - Server name */
eac3a0a0 876cups_gss_getname(
f7deaa1a 877 http_t *http, /* I - Connection to server */
878 const char *service_name) /* I - Service name */
879{
880 gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
881 /* Service token */
bc44d920 882 OM_uint32 major_status, /* Major status code */
883 minor_status; /* Minor status code */
884 gss_name_t server_name; /* Server name */
eac3a0a0 885 char buf[1024]; /* Name buffer */
bc44d920 886
887
eac3a0a0 888 DEBUG_printf(("7cups_gss_getname(http=%p, service_name=\"%s\")", http,
e07d4801
MS
889 service_name));
890
891
bc44d920 892 /*
893 * Get the hostname...
894 */
f7deaa1a 895
eac3a0a0
MS
896 if (!http->gsshost[0])
897 {
898 httpGetHostname(http, http->gsshost, sizeof(http->gsshost));
bc44d920 899
eac3a0a0
MS
900 if (!strcmp(http->gsshost, "localhost"))
901 {
902 if (gethostname(http->gsshost, sizeof(http->gsshost)) < 0)
903 {
904 DEBUG_printf(("1cups_gss_getname: gethostname() failed: %s",
905 strerror(errno)));
906 http->gsshost[0] = '\0';
907 return (NULL);
908 }
909
910 if (!strchr(http->gsshost, '.'))
911 {
912 /*
913 * The hostname is not a FQDN, so look it up...
914 */
915
916 struct hostent *host; /* Host entry to get FQDN */
917
918 if ((host = gethostbyname(http->gsshost)) != NULL && host->h_name)
919 {
920 /*
921 * Use the resolved hostname...
922 */
923
924 strlcpy(http->gsshost, host->h_name, sizeof(http->gsshost));
925 }
926 else
927 {
928 DEBUG_printf(("1cups_gss_getname: gethostbyname(\"%s\") failed.",
929 http->gsshost));
930 http->gsshost[0] = '\0';
931 return (NULL);
932 }
933 }
934 }
935 }
f7deaa1a 936
937 /*
eac3a0a0 938 * Get a service name we can use for authentication purposes...
f7deaa1a 939 */
940
eac3a0a0 941 snprintf(buf, sizeof(buf), "%s@%s", service_name, http->gsshost);
f7deaa1a 942
eac3a0a0 943 DEBUG_printf(("8cups_gss_getname: Looking up \"%s\".", buf));
7ff4fea9 944
f7deaa1a 945 token.value = buf;
946 token.length = strlen(buf);
947 server_name = GSS_C_NO_NAME;
948 major_status = gss_import_name(&minor_status, &token,
949 GSS_C_NT_HOSTBASED_SERVICE,
950 &server_name);
951
952 if (GSS_ERROR(major_status))
953 {
e07d4801 954 cups_gss_printf(major_status, minor_status,
eac3a0a0 955 "cups_gss_getname: gss_import_name() failed");
f7deaa1a 956 return (NULL);
957 }
958
959 return (server_name);
960}
e07d4801
MS
961
962
963# ifdef DEBUG
964/*
eac3a0a0 965 * 'cups_gss_printf()' - Show debug error messages from GSSAPI.
e07d4801
MS
966 */
967
968static void
969cups_gss_printf(OM_uint32 major_status,/* I - Major status code */
970 OM_uint32 minor_status,/* I - Minor status code */
971 const char *message) /* I - Prefix for error message */
972{
973 OM_uint32 err_major_status, /* Major status code for display */
974 err_minor_status; /* Minor status code for display */
975 OM_uint32 msg_ctx; /* Message context */
976 gss_buffer_desc major_status_string = GSS_C_EMPTY_BUFFER,
977 /* Major status message */
978 minor_status_string = GSS_C_EMPTY_BUFFER;
979 /* Minor status message */
980
981
982 msg_ctx = 0;
983 err_major_status = gss_display_status(&err_minor_status,
984 major_status,
985 GSS_C_GSS_CODE,
986 GSS_C_NO_OID,
987 &msg_ctx,
988 &major_status_string);
989
990 if (!GSS_ERROR(err_major_status))
991 gss_display_status(&err_minor_status, minor_status, GSS_C_MECH_CODE,
992 GSS_C_NULL_OID, &msg_ctx, &minor_status_string);
993
68b10830 994 DEBUG_printf(("1%s: %s, %s", message, (char *)major_status_string.value,
e07d4801
MS
995 (char *)minor_status_string.value));
996
997 gss_release_buffer(&err_minor_status, &major_status_string);
998 gss_release_buffer(&err_minor_status, &minor_status_string);
999}
1000# endif /* DEBUG */
f7deaa1a 1001#endif /* HAVE_GSSAPI */
1002
1003
ef416fc2 1004/*
1005 * 'cups_local_auth()' - Get the local authorization certificate if
eac3a0a0 1006 * available/applicable.
ef416fc2 1007 */
1008
f7deaa1a 1009static int /* O - 0 if available */
bc44d920 1010 /* 1 if not available */
f7deaa1a 1011 /* -1 error */
ef416fc2 1012cups_local_auth(http_t *http) /* I - HTTP connection to server */
1013{
1014#if defined(WIN32) || defined(__EMX__)
1015 /*
1016 * Currently WIN32 and OS-2 do not support the CUPS server...
1017 */
1018
bc44d920 1019 return (1);
ef416fc2 1020#else
f7deaa1a 1021 int pid; /* Current process ID */
1022 FILE *fp; /* Certificate file */
e07d4801 1023 char trc[16], /* Try Root Certificate parameter */
6961465f 1024 filename[1024]; /* Certificate filename */
1f717210
MS
1025 const char *www_auth, /* WWW-Authenticate header */
1026 *schemedata; /* Data for the named auth scheme */
ef416fc2 1027 _cups_globals_t *cg = _cupsGlobals(); /* Global data */
bc44d920 1028# if defined(HAVE_AUTHORIZATION_H)
f7deaa1a 1029 OSStatus status; /* Status */
1030 AuthorizationItem auth_right; /* Authorization right */
1031 AuthorizationRights auth_rights; /* Authorization rights */
1032 AuthorizationFlags auth_flags; /* Authorization flags */
1033 AuthorizationExternalForm auth_extrn; /* Authorization ref external */
1034 char auth_key[1024]; /* Buffer */
1035 char buffer[1024]; /* Buffer */
bc44d920 1036# endif /* HAVE_AUTHORIZATION_H */
ef416fc2 1037
1038
807315e6 1039 DEBUG_printf(("7cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"", (void *)http, httpAddrString(http->hostaddr, filename, sizeof(filename)), http->hostname));
ef416fc2 1040
1041 /*
1042 * See if we are accessing localhost...
1043 */
1044
1f717210 1045 if (!httpAddrLocalhost(http->hostaddr) && _cups_strcasecmp(http->hostname, "localhost") != 0)
ef416fc2 1046 {
e07d4801 1047 DEBUG_puts("8cups_local_auth: Not a local connection!");
bc44d920 1048 return (1);
ef416fc2 1049 }
1050
1f717210
MS
1051 www_auth = httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE);
1052
bc44d920 1053# if defined(HAVE_AUTHORIZATION_H)
f7deaa1a 1054 /*
1055 * Delete any previous authorization reference...
1056 */
f14324a7 1057
b94498cf 1058 if (http->auth_ref)
f7deaa1a 1059 {
b94498cf 1060 AuthorizationFree(http->auth_ref, kAuthorizationFlagDefaults);
1061 http->auth_ref = NULL;
f7deaa1a 1062 }
1063
1f717210 1064 if (!getenv("GATEWAY_INTERFACE") && (schemedata = cups_auth_find(www_auth, "AuthRef")) != NULL && cups_auth_param(schemedata, "key", auth_key, sizeof(auth_key)))
f7deaa1a 1065 {
1f717210 1066 status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment, kAuthorizationFlagDefaults, &http->auth_ref);
f7deaa1a 1067 if (status != errAuthorizationSuccess)
1068 {
e07d4801 1069 DEBUG_printf(("8cups_local_auth: AuthorizationCreate() returned %d (%s)",
f7deaa1a 1070 (int)status, cssmErrorString(status)));
1071 return (-1);
1072 }
1073
1074 auth_right.name = auth_key;
1075 auth_right.valueLength = 0;
1076 auth_right.value = NULL;
1077 auth_right.flags = 0;
1078
1079 auth_rights.count = 1;
1080 auth_rights.items = &auth_right;
1081
f14324a7 1082 auth_flags = kAuthorizationFlagDefaults |
f7deaa1a 1083 kAuthorizationFlagPreAuthorize |
f14324a7 1084 kAuthorizationFlagInteractionAllowed |
f7deaa1a 1085 kAuthorizationFlagExtendRights;
1086
f14324a7
MS
1087 status = AuthorizationCopyRights(http->auth_ref, &auth_rights,
1088 kAuthorizationEmptyEnvironment,
f7deaa1a 1089 auth_flags, NULL);
1090 if (status == errAuthorizationSuccess)
b94498cf 1091 status = AuthorizationMakeExternalForm(http->auth_ref, &auth_extrn);
f7deaa1a 1092
1093 if (status == errAuthorizationSuccess)
1094 {
1095 /*
1096 * Set the authorization string and return...
1097 */
1098
f14324a7 1099 httpEncode64_2(buffer, sizeof(buffer), (void *)&auth_extrn,
f7deaa1a 1100 sizeof(auth_extrn));
1101
355e94dc 1102 httpSetAuthString(http, "AuthRef", buffer);
f7deaa1a 1103
e07d4801 1104 DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
f7deaa1a 1105 http->authstring));
1106 return (0);
1107 }
1108 else if (status == errAuthorizationCanceled)
1109 return (-1);
1110
e07d4801 1111 DEBUG_printf(("9cups_local_auth: AuthorizationCopyRights() returned %d (%s)",
f7deaa1a 1112 (int)status, cssmErrorString(status)));
1113
1114 /*
1115 * Fall through to try certificates...
1116 */
1117 }
bc44d920 1118# endif /* HAVE_AUTHORIZATION_H */
f7deaa1a 1119
1f717210
MS
1120# ifdef HAVE_GSSAPI
1121 if (cups_auth_find(www_auth, "Negotiate"))
1122 return (1);
1123# endif /* HAVE_GSSAPI */
1124# ifdef HAVE_AUTHORIZATION_H
1125 if (cups_auth_find(www_auth, "AuthRef"))
1126 return (1);
1127# endif /* HAVE_AUTHORIZATION_H */
1128
f11a948a
MS
1129# if defined(SO_PEERCRED) && defined(AF_LOCAL)
1130 /*
1131 * See if we can authenticate using the peer credentials provided over a
1132 * domain socket; if so, specify "PeerCred username" as the authentication
1133 * information...
1134 */
1135
1f717210
MS
1136 if (http->hostaddr->addr.sa_family == AF_LOCAL &&
1137 !getenv("GATEWAY_INTERFACE") && /* Not via CGI programs... */
1138 cups_auth_find(www_auth, "PeerCred"))
f11a948a
MS
1139 {
1140 /*
1141 * Verify that the current cupsUser() matches the current UID...
1142 */
1143
1144 struct passwd *pwd; /* Password information */
1145 const char *username; /* Current username */
1146
1147 username = cupsUser();
1148
1149 if ((pwd = getpwnam(username)) != NULL && pwd->pw_uid == getuid())
1150 {
1151 httpSetAuthString(http, "PeerCred", username);
1152
1153 DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
1154 http->authstring));
1155
1156 return (0);
1157 }
1158 }
1159# endif /* SO_PEERCRED && AF_LOCAL */
1160
1f717210
MS
1161 if ((schemedata = cups_auth_find(www_auth, "Local")) == NULL)
1162 return (1);
1163
ef416fc2 1164 /*
1165 * Try opening a certificate file for this PID. If that fails,
1166 * try the root certificate...
1167 */
1168
1169 pid = getpid();
1170 snprintf(filename, sizeof(filename), "%s/certs/%d", cg->cups_statedir, pid);
1171 if ((fp = fopen(filename, "r")) == NULL && pid > 0)
1172 {
bc44d920 1173 /*
e07d4801 1174 * No certificate for this PID; see if we can get the root certificate...
bc44d920 1175 */
1176
1f717210 1177 DEBUG_printf(("9cups_local_auth: Unable to open file %s: %s", filename, strerror(errno)));
e07d4801 1178
1f717210 1179 if (!cups_auth_param(schemedata, "trc", trc, sizeof(trc)))
e07d4801
MS
1180 {
1181 /*
1182 * Scheduler doesn't want us to use the root certificate...
1183 */
1184
1185 return (1);
1186 }
1187
ef416fc2 1188 snprintf(filename, sizeof(filename), "%s/certs/0", cg->cups_statedir);
1189 fp = fopen(filename, "r");
1190 }
1191
f7deaa1a 1192 if (fp)
ef416fc2 1193 {
f7deaa1a 1194 /*
1195 * Read the certificate from the file...
1196 */
ef416fc2 1197
6961465f
MS
1198 char certificate[33], /* Certificate string */
1199 *certptr; /* Pointer to certificate string */
1200
1201 certptr = fgets(certificate, sizeof(certificate), fp);
f7deaa1a 1202 fclose(fp);
ef416fc2 1203
6961465f
MS
1204 if (certptr)
1205 {
1206 /*
1207 * Set the authorization string and return...
1208 */
ef416fc2 1209
6961465f 1210 httpSetAuthString(http, "Local", certificate);
ef416fc2 1211
6961465f
MS
1212 DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
1213 http->authstring));
ef416fc2 1214
6961465f
MS
1215 return (0);
1216 }
f7deaa1a 1217 }
1218
1219 return (1);
ef416fc2 1220#endif /* WIN32 || __EMX__ */
1221}